Lynne Spears went swimming with Jayden James Federline, Sean Preston Federline, and Jamie Lynn Spears's toddler daughter, Maddie Aldridge, in Dallas, TX, on Monday. The grandmother of three showed off her impressive figure in a black one-piece swimsuit while the kids splashed around in the pool. Jayden and Sean spent some quality time with Lynne and their cousin Maddie as Britney Spears continued on her Femme Fatale tour in the Texas city this week. The concerts kicked off in June, with the North American leg of the tour set to wrap in late August. Britney will then go to Europe, where she will perform in countries from Russia to Switzerland before closing the series of shows in Portugal in November.